VDB-160611 · CVE-2020-8335 · GCVE-0-2020-8335

Lenovo ThinkPad X395 BIOS privileges management

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Lenovo ThinkPad A285, ThinkPad A485, ThinkPad T495, ThinkPad T495s and ThinkPad X395 and classified as critical. Affected by this vulnerability is an unknown functionality of the component BIOS Handler. Performing a manipulation results in privileges management. This vulnerability is identified as CVE-2020-8335. The attack may be carried out on the physical device. There is not any exploit available.

Detailsinfo

A vulnerability was found in Lenovo ThinkPad A285, ThinkPad A485, ThinkPad T495, ThinkPad T495s and ThinkPad X395. It has been classified as critical. This affects an unknown part of the component BIOS Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The BIOS tamper detection mechanism was not triggered in Lenovo ThinkPad A285, BIOS versions up to r0xuj70w; A485, BIOS versions up to r0wuj65w; T495 BIOS versions up to r12uj55w; T495s/X395, BIOS versions up to r13uj47w, while the emergency-reset button is pressed which may allow for unauthorized access.

The weakness was released 09/01/2020 (Website). It is possible to read the advisory at support.lenovo.com. This vulnerability is uniquely identified as CVE-2020-8335 since 01/28/2020. The exploitability is told to be difficult. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entry connected to this vulnerability is available at VDB-160612. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Lenovo

Name

License

commercial

Website

Vendor: https://www.lenovo.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.4
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/28/2020 🔍
09/01/2020 +217 days 🔍
09/02/2020 +1 days 🔍
11/12/2020 +71 days 🔍

Sourcesinfo

Vendor: lenovo.com

Advisory: support.lenovo.com
Status: Not defined

CVE: CVE-2020-8335 (🔍)
GCVE (CVE): GCVE-0-2020-8335
GCVE (VulDB): GCVE-100-160611
See also: 🔍

Entryinfo

Created: 09/02/2020 08:11
Updated: 11/12/2020 13:03
Changes: 09/02/2020 08:11 (37), 09/02/2020 08:16 (11), 11/12/2020 13:03 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.